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Which risk increases when illuminating an optical fiber array with spatially incoherent light?

A)Modal dispersion effects increase sharply
B)Reduced fiber coupling damage thresholds
C)Increased chromatic material aberrations
D)Enhanced multi-photon absorption phenomena

💡 Explanation

Modal dispersion increases because spatially incoherent light excites many propagation modes of the fiber, leading to variations in arrival times. Therefore the signal broadens, rather than maintaining pulse integrity, because spatially coherent light is needed to excite primarily the fundamental mode and limit this effect.

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